Thus , for instance , it may come as a shock to mathematicians to learn that the schrodinger equation for the hydrogen atom is not a literally correct description of this atom , but only an approximation to a somewhat more correct equation taking account of spin , magnetic dipole , and relativistic effects ; and that this corrected equation is itself only an imperfect approximation to an infinite set of quantum field - theoretical equations 因此,举例来说,对数学家而言,了解到下述情形可能会令其惊愕不已,即薛定谔( schrodinger )的氢原子方程式并非是对该原子作出的一种绝然正确的描述,而仅仅是个近似值,趋近于一个在某种程度上更为正确的将自旋、磁性偶极子、以及相对论效应考虑在内的方程式;而这个得以纠正的方程式就其本身而言也只是一个不完美的近似值,趋近于无穷无尽的一整套量子场论方程式。